Knowledge Bank

Vibration-rotation spectra of the $\nu 3$ fundamental band of $\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}O3$ and the five isotopes obtained by substitution of each $\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}O$ atom by $\mathrm{<mrow\; data-mjx-texclass="ORD">18</mrow>}O$ have been recorded using a tunable diode laser system at NASA Langley Research Center. The various isotopic mixtures have been prepared from 99.98% $\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}O$-enriched and 96.5% $\mathrm{<mrow\; data-mjx-texclass="ORD">18</mrow>}O$-enriched oxygen samples by electrical discharge. Spectra of nearly pure $\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}O3$, nearly pure $\mathrm{<mrow\; data-mjx-texclass="ORD">18</mrow>}O3$, and mixtures of these isotopes and $\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}O\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}O\mathrm{<mrow\; data-mjx-texclass="ORD">18</mrow>}O,\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}O\mathrm{<mrow\; data-mjx-texclass="ORD">18</mrow>}O\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}O,\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}O\mathrm{<mrow\; data-mjx-texclass="ORD">18</mrow>}O\mathrm{<mrow\; data-mjx-texclass="ORD">18</mrow>}O$, and $\mathrm{<mrow\; data-mjx-texclass="ORD">18</mrow>}O\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}O\mathrm{<mrow\; data-mjx-texclass="ORD">18</mrow>}O$ will be shown. Intensities and air-broadened halfwidths have been derived for selected lines.